Knox vs Onyx

Baby Name Comparison — 2026

Knox

Boy #209 Most Popular 1 Syllable

Meaning

"round hill"

Origin: Old English/Scottish

Cultural Roots

American Scottish English

Quick Stats

Popularity Rank
#209
Total SSA Count
1,701
Syllables
1
Formality
Moderate

Playground Safety Score

✓ All Clear
Full profile for Knox →

Popularity Comparison

Knox Rank #209
Onyx Rank #359

Knox is more popular, ranked #209 vs #359 for Onyx.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Knox ___

  • Knox James
  • Knox Oliver
  • Knox William
  • Knox Henry
  • Knox Alexander
  • Knox Reid

Onyx ___

  • Onyx James
  • Onyx Cole
  • Onyx Reed
  • Onyx Sage
  • Onyx Atlas
  • Onyx Stone

Sibling Name Ideas

Names that pair well as siblings.

If you choose Knox

Ryder Lennox Jagger Saylor Piper

If you choose Onyx

Jade Phoenix Flint Raven Zane

Which Name Fits Your Family?

Answer 3 quick questions and we'll help you decide.

1. Which style feels more like your family?

Frequently Asked Questions

Is Knox or Onyx more popular?

Knox is more popular, ranked #209 compared to Onyx at #359 in the United States.

What do Knox and Onyx mean?

Knox means "round hill" (Old English/Scottish origin). Onyx means "black gemstone" (Greek (onyx) origin).

Are Knox and Onyx boy or girl names?

Knox is primarily a boy name. Onyx is primarily a boy name.

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← Full profile: Knox ← Full profile: Onyx Browse all baby names